The key problem with Ken Wilberís
approach is very easy to identify in that he misleadingly interprets development
in terms of just one forward direction (i.e. transcendent).

Thus he repeatedly states that development
is the process by which each (lower) is transcended and included in a (higher)
stage.

As with many of his ideas, his manner
of dealing with immanence has not been properly consistent in his various
writings. However his recent position would seem to identify immanence
in terms of the top-down attempt to integrate each lower from the perspective
of the corresponding higher stage.

However this does not strictly represent
immanence but rather the transcendent aspect of integration.

The point is that the transcendent
and immanent directions are equally important so that we can identify the
forward development of Spirit with either aspect.

Only when we explicitly realise these
two directions and then recognise their complementary nature through interaction
with each other, can we hope to give a balanced interpretation of both
differentiation and integration (each with forward and backward aspects).